17. SPERMOPHILA. 91 



Range. From Texas, throughout Central America and all over 

 South America, except the extreme southern portions of Chili and 

 Patagonia. 



Key to the Species. 



a. With do black on the crown ; forehead only- 



black ; ear-coverts black albigularis, p. 93. 



b. With no black whatever on the crown. 

 a'. No chestnut on the abdomen. 



a". No chestnut on the throat. 



a'". With a white alarspeculum at the base 



of the primaries. 



a i . No white bands on the tips of the 



wing-coverts ; general colour ashy. 



a 5 . Throat white, as well as the 



cheeks ; no grey on the throat . . hypoleuca, p. 94. 

 b 5 . Throat dark slaty grey ; no white 

 on the cheeks or chin; eyelid 



dusky grisea, p. 96. 



c 5 . Chin and entire throat light ashy 

 grey ; a white spot at the base of 



the cheeks ; eyelid white plumbea, p. 97. 



d 5 . Throat light ashy grey ; chin and 

 base of cheeks white ; eyelid 



white whiteleyana, p. 98. 



e s . Similar to the foregoing, but with 

 the entire throat white as well as 



the fore part of the cheeks colombiana, p. 99. 



b l . A white tip to the wing-coverts, 

 producing a double wing-bar ; 

 general colour brown or olive- 

 brown. 

 / 5 . Head greyer than back, with a 

 white supraloral spot in adult 

 bird ; a narrow eyebrow and 

 cheeks white ; sides of face dark 



ashy superciliaris, p. 99. 



g b . Smaller : head like the back ; ear- 

 coverts like the crown ; no white 



on the eyebrow or cheeks simplex, p. 100. 



b'' '. No alar speculum ; general colour 

 brown, especially on the wings and 

 tail. 

 e 4 . Larger : wing 2 - l-2 - 25 inches; wing- 

 coverts edged with olive-brown . . obscura, p. 101. 

 d l . Smaller : wing 2 inches ; wing- 

 coverts edged with reddish brown. . pauper } j>. 102. 



b". Chin and upper throat chestnut telasco, p. 102. 



b'. Abdomen grey or whitish ; under tail- 

 coverts chestnut. 

 c". No white spot on the tail. 



c'". Larger: back streaked; colour light 



grey inornata, p. 104. 



d'". Smaller: back uniform; colour black- 

 ish grey homochroa, p. 105. 



